char[] numbers = { '1', '2', '3' };
Integer[] numbers2 = {1,2,3 }; System.out.println(numbers.toString());
System.out.println(numbers);
System.out.println(numbers2);常规来说,输出都一致才是,为什么会有这样的区别呢?
Integer[] numbers2 = {1,2,3 }; System.out.println(numbers.toString());
System.out.println(numbers);
System.out.println(numbers2);常规来说,输出都一致才是,为什么会有这样的区别呢?
System.out.println(numbers.toString());
这句调用Object的toString(),toString()打印出内容+哈希码 一般要重写toString() 才能得到你想要的结果
public void write(byte b[], int off, int len) throws IOException {
if (b == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
for (int i = 0 ; i < len ; i++) {
write(b[off + i]);
}
}
要打印数组中的所有元素请用System.out.println(java.util.Arrays.toString(array));
1:主要看System.out.println(xx)这个方法如何处理xx.
2:yy.toString();如何处理